YAMATAKE/Azbil Transmitter KDP71-773210200A1

06/14/2020

Refrigeration compressor installation conditions and precautions

The selection of the installation site is ignored by the staff. Often the compressor will be found at random after it is purchased and used immediately after piping.

06/29/2020

Compression ratio of American Copeland compressor

06/14/2020

Common air conditioning host

Common air conditioning host 1. Water-cooled chiller The water-cooled chiller belongs to the refrigeration unit part in the central air-conditioning system. Its refrigerant is water, which is called the chiller, and the cooling of the condenser is r器2䀀
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06/20/2020

What are the causes of air conditioning trip

What are the causes of air conditioning trip 1. The contradiction between the rated current of the air conditioner and the current carrying capacity of the wire. 　　Here are two formulas involved: 　　①The rated current of air conditioner I=P÷U ÷power factor, the power remains unchanged, the smaller the voltage, the greater the current required. 　　② The current carrying capacity of the wire I=U÷R, the voltage is proportional to the current. 　　 So when the power supply voltage is normal, we must consider the line voltage drop. The longer the line, the greater the resistance, the greater the voltage drop, and the smaller the output current at the end. However, because the power of the load remains unchanged, the voltage becomes smaller, and the current that needs to be output will be larger. At this time, the wire is forced to overload, and the time will cause heating, and eventually cause the tripping of the open circuit. 　　 Some friends said that the heat of the wire will not cause the tripping of the circuit breaker. In fact, the manufacturer of the air switch has made it clear in the relevant manuals that the heat of the wire will cause the air switch to trip. Because the wire heats up, the crimp terminal will also heat up, and the resistance will become larger and larger. The larger the resistance, the greater the current consumption, and the hotter it will be, a vicious cycle. 　　 2. Leakage 　　During the daily maintenance work, we will encounter the situation that the air circuit trips due to the leakage of electricity. At least I have not experienced it once or twice. Regardless of the leakage of the neutral line or the leakage of the live line, a long time will cause the circuit breaker to trip. 　　Why does the electric leakage cause the MCB to trip? There are two situations. 　　 ① Good grounding. At the beginning, the leakage current was not large, and as time went by, the leakage current became larger and larger, and eventually evolved into a short circuit to ground, unable to close. 　　②There is no ground wire. If the equipment is not connected to the protective ground, when the wire leaks to the equipment, it is equivalent to adding a large shunt resistance. Like this problem, if the air conditioner does not have a ground wire, when the wire leaks to the air conditioner, the air conditioner is a very large shunt resistor and will consume a lot of current. Eventually, the wire will heat up or trip open. 　　How to determine whether the trip caused by the above two aspects can be done with a clamp ammeter. 　　 ① Measure the voltage at the input and output to see if there is a significant change in voltage drop. 　　②Measure whether the output current exceeds the standard. 　　 So my suggestion is: first measure the supply voltage to see if it is within the allowable fluctuation range. Then measure the current to see if it exceeds the rated ampacity of the wire. Finally, check the data one by one according to the measured data to find out the reason.

06/25/2020

Talking about the working process and working principle of screw compressor

Screw compressors, also known as screw compressors, are divided into single screw compressors and twin screw compressors. The single-screw compressor was developed by Sinn of France in the 1970s. Because its structure is more reasonable, it is quickly applied to the field of national defense and protected by the developing country.

07/22/2020

Maintenance example of poor cooling effect of inverter air conditioner

Today, I will tell you about the maintenance example of the poor cooling effect of the air conditioner.<br></br> <br></br> 1. The cooling is poor, and the operating frequency is not up to the highest. The exhaust pipe overheating code will be displayed for about 20 minutes.<br></br>

09/07/2020

Application of pressure dew point in compressed air system

The air that is reduced in volume and increased in pressure by the mechanical movement of the air compressor is called compressed air. Compressed air is an important power source and is widely used in many industrial fields such as machinery, metallurgy, electronics, electric power,

08/07/2020

Technical post: Use icons to tell you the difference between constant speed and frequency conversion!

The fixed speed air conditioner means that the speed of the internal compressor motor is constant and the temperature is adjusted by switching the compressor on and off.

05/31/2024

Solenoid Valve Types: the Most Complete Guide

The solenoid valve is one of the common valves in industrial control systems. It can control the opening and closing of the valve through electromagnetic force, thereby achieving control of the gas and liquid lines.

09/09/2020

How big the air compressor is, these two technical parameters must be known

People often come to inquire about how much it costs to buy a screw air compressor, but when I ask the person how big a screw air compressor you need, many users really can’t answer and cannot determine the size of the air compressor.